Interests

My research is concerned with how neural circuits process information and use it as a basis for learning and behavioural control.

My current work focuses on the role of fronto-striatal circuits in governing impulsive decision making and in the control of attention and behaviour.

Methodologically, I address these questions in awake, freely moving animals using innovative wireless multi-site electrophysiological recording techniques in order to correlate neural activity signatures with behavioural features. In parallel, I work closely with microelectronic technologists to develop and implement next-generation neuro-technologies incorporating a variety of functions alongside multi-site electrophysiology ranging from real-time neurochemical sensing, microfluidic drug delivery and multi-site optogenetic stimulation.

Wireless multi-site electrophysiology and optogenetics in behaving rats.
Wireless multi-site electrophysiology and optogenetics in behaving rats.
View image full-size (2325x3188 pixels)

Research Focus

Keywords

impulsivity

electrophysiology

information processing

networks

optogenetics

Clinical conditions

Addiction

Equipment

Behavioural analysis

Electrophysiological recording techniques

Collaborators

Cambridge

Jeff Dalley

Ole Paulsen

Gert van Dijk

International

Pablo Blasquez Web: http://vor.wustl.edu/

Olivier Frey Web: http://www.bsse.ethz.ch/bel/peo...

Henrik Jorntell Web: http://www.lunduniversity.lu.se/o.o.i.s...

Patrick Ruther Web: http://www.imtek.de/materia...

Key publications

Fan D, Rich D, Holtzman T, Ruther P, Dalley JW, Lopez A, Rossi MA, Barter JW, Salas-Meza D, Herwik S, Holzhammer T, Morizio J, Yin HH (2011), “A wireless multi-channel recording system for freely behaving mice and rats.” PLoS One 6(7):e22033 Details

Holtzman T, Sivam V, Zhao T, Frey O, Dow van der Wal P, Derooj NF, Dalley JW, Edgley SA (2011), “Multiple extra-synaptic spillover mechanisms regulate prolonged activity in cerebellar Golgi cell - granule cell loops.” J Physiol Details

Frey O, Holtzman T, McNamara RM, Theobald DE, van der Wal PD, de Rooij NF, Dalley JW, Koudelka-Hep M (2010), “Enzyme-based choline and L-glutamate biosensor electrodes on silicon microprobe arrays.” Biosens Bioelectron 26(2):477-84 Details

Mostofi A, Holtzman T, Grout AS, Yeo CH, Edgley SA (2010), “Electrophysiological localization of eyeblink-related microzones in rabbit cerebellar cortex.” J Neurosci 30(26):8920-34 Details

Publications

2012

Spieth S, Schumacher A, Holtzman T, Rich PD, Theobald DE, Dalley JW, Nouna R, Messner S, Zengerle R (2012), “An intra-cerebral drug delivery system for freely moving animals.” Biomed Microdevices 14(5):799-809 Details

2011

Frey O, Holtzman T, McNamara RM, Theobald DEH, van der Wal PD, de Rooij NF, Dalley JW & Kouldelka-Hep M. (2011), “Simultaneous neurochemical stimulation and recording using an assembly of biosensor silicon microprobes and SU-8 microinjectors. ” Sensors & Actuators B: Chemical. 2011 154(2): 96-105

Ruther P, Holzhammer T, Herwik S, Rich PD, Dalley JW, Paul O, Holtzman T (2011), “Compact wireless neural recording system for small animals using silicon-based probe arrays.” Conf Proc IEEE Eng Med Biol Soc 2011:2284-7 Details

2009

Holtzman T, Cerminara NL, Edgley SA, Apps R (2009), “Characterization in vivo of bilaterally branching pontocerebellar mossy fibre to Golgi cell inputs in the rat cerebellum.” Eur J Neurosci 29(2):328-39 Details

2006

Holtzman T, Mostofi A, Phuah CL, Edgley SA (2006), “Cerebellar Golgi cells in the rat receive multimodal convergent peripheral inputs via the lateral funiculus of the spinal cord.” J Physiol 577(Pt 1):69-80 Details

Holtzman T, Rajapaksa T, Mostofi A, Edgley SA (2006), “Different responses of rat cerebellar Purkinje cells and Golgi cells evoked by widespread convergent sensory inputs.” J Physiol 574(Pt 2):491-507 Details